Debian/Knoppix add new user.

I have searched all the root and user GUI menus and can not find
a way to add a new user. It stands to reason that there should be
a user manager somewhere, but I can't find it.

I tried to add a new user by using adduser, but wound up missing
most of the information required to make a usable new user.

Is it possible to remove user knoppix?

Bob Lindley